Talk:Isotopes of potassium

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31K
31K gets one mention and some links, but is otherwise ignored in the article. Do we fully include or fully exclude it? Hcobb (talk) 15:47, 11 October 2020 (UTC)
 * In the articles Potassium and Isotopes of potassium I did not find any mentioning of 31K (potassium-31). Could you point out where you see those mentionings? -DePiep (talk) 19:09, 11 October 2020 (UTC)

From this article:

"All other potassium isotopes have half-lives under a day, most under a minute. The least stable is 31K, a three-proton emitter discovered in 2019; its half-life was measured to be shorter than 10 picoseconds.[4][5]"

Hcobb (talk) 18:10, 12 October 2020 (UTC)
 * Oops, it's in there.
 * Now could it be the 10 picoseconds (very short HL) that makes this one 'not recognised as an isotope'? (I could not find such a treshold though). -DePiep (talk) 18:20, 12 October 2020 (UTC)
 * I added it to the table and lead section; its observation and very short half-life are clearly described in the sources. I believe it is still recognized as an isotope (one threshold I found is ~10−12 s, but we include unbound states on the order of 10−22 s, so that doesn't matter). However, as far as I can tell, the intermediate isotope 32K is still unobserved, though it is most likely unbound as well. ComplexRational (talk) 20:46, 12 October 2020 (UTC)

42K
Shouldn't 42K be a trace radionuclide because on the Isotopes of argon page, it says 42Ar is a trace radionuclide. 42Ar β− decays into 42K so shouldn't 42K be a trace radionuclide? -322UbnBr2 (Talk &#124; Contributions &#124; Actions) 03:40, 14 November 2020 (UTC)

Contribution of 40K to the geothermal gradient?
Should some mention be made of the contribution of 40K to the geothermal gradient, assuming it is still accepted as such? Vaughan Pratt (talk) 06:20, 21 July 2021 (UTC)

Half-life of beta plus decay
"40K has the longest known half-life for any positron-emitter nuclide." I suppose that this refers to the partial half-life of beta plus decay. When just talking about the half-life, 138La has a longer one. 2A04:CEC0:1011:B1F1:C5E3:F416:5CD7:1B03 (talk) 23:20, 13 November 2023 (UTC)